锻压技术

GH4706高温合金斜I型环件轧制成形及组织与性能研究

英文标题：Rolling of oblique I-shaped ring piece for superalloy GH4706 and study on microstructure and properties

单位：1.中国航发沈阳发动机研究所 2. 贵州航宇科技发展股份有限公司 3.西北工业大学材料学院 4. 中国航发沈阳黎明航空发动机有限责任公司技术中心

分类号：TG306

出版年,卷(期):页码：2024,49(10):99-104

摘要：

通过有限元方法对GH4706高温合金矩形环件和斜I型环件的轧制成形过程进行了数值模拟，得到2种轧制工艺下的应变分布与温度分布情况，并对相同名义成形参数条件下矩形环件和斜I形环件的显微组织和力学性能进行了对比分析。结果表明：斜I形环件轧制成形后大端面内环处的等效应变最大，达到6以上，最大温差为200 ℃；而矩形环件轧制成形后的等效应变较小，最大等效应变约为4，最大温差仅为50~60 ℃。因此，可以采用矩形环坯轧制成形斜I形环件，但因其温度与等效应变分布均匀性较低，相较于矩形环件其成形难度更大。通过实际试验验证，在保证性能和组织要求的前提下，采用1050 ℃预轧+1030 ℃终轧的方法可以对GH4706高温合金斜I形环件进行轧制，且实际环件成形完整，无成形缺陷。

The rolling processes of rectangular and oblique I-shaped ring pieces for superalloy GH4706 were simulated by finite element method, and the strain and temperature distributions after two types of rolling process were obtained. Then, the microstructures and mechanical properties of rectangular and oblique I-shaped ring pieces under the same nominal forming parameters were compared and analyzed. The results show that after rolling the oblique I-shaped ring piece, the equivalent strain at the inner ring of large end face is the highest, reaching six or more, and the maximum temperature difference reaches 200 ℃. However, the equivalent strain of rectangular ring piece after rolling is relatively small, with the maximum equivalent strain of only close to four and the maximum temperature difference of only 50-60 ℃. Thus, the oblique I-shaped ring piece can be formed by rolling the rectangular ring blank, but the uniformity of temperature and equivalent strain distributions is lower, making it more difficult to form compared to the rectangular ring piece. Through practical experiments, it can be verified that under the premise of ensuring performance and organizational requirements, the method of pre-rolling at 1050 ℃ + final rolling at 1030 ℃ can be used to roll superalloy GH4706 oblique I-shaped ring piece, and the actual ring forming is complete without forming defects.

基金项目：

作者简介：周涛（1982-），男，硕士，高级工程师,E-mail：ztzhzya@163.com;通信作者：王建国（1987-），男，博士，助理研究员,E-mail：jianguow@nwpu.edu.cn

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